Phrases Offering and Refusing Help

I'm perfectly capable; I just need to focus.

C1

Meaning

I'm able to do this; I just need concentration.

Example sentences

John: You look stressed. Need some help with that project?

Alice: Thanks, but no. I'm perfectly capable; I just need to focus.

John: Okay, just let me know if you change your mind.

Alice: Will do. Honestly, I'm perfectly capable; I just need to focus and get it done.